1,5(6)-Disubstituted benzizimidazole-2-carbamate derivatives having anthelmintic activity

ABSTRACT

WHERE R is lower alkyl having 1 to 4 carbon atoms; R1 is -SOR2, -SR5, -OR5 or M&#39;&#39;(CH2)nMR7; R2 is lower alkyl having from 1 to 6 carbon atoms, cycloalkyl having 3 to 7 carbon atoms, lower alkenyl or lower alkynyl having 3 to 6 carbon atoms, or aralkyl or aryl; R5 is lower alkenyl, lower alkynyl or aralkyl; R7 is lower alkyl having 1 to 4 carbon atoms or aryl; M and M&#39;&#39; are independently N IS 1-4; AND R8 is phenyl, benzyl, phenethyl, or lower alkyl having 1 to 12 carbon atoms optionally substituted with a -COOR group where R is lower alkyl having 1 to 4 carbon atoms; The compounds are useful as pesticides, particularly as anthelmintic and antifungal agents.   This application relates to 1,5(6)-disubstituted benzimidazole2-carbamate derivatives represented by the following formula:

United States Patent 1 1 Beard et a1.

[ 1 Dec. 30, 1975 [54] 1,5(6)-DISUBSTITUTED BENZIZlMIDAZOLE-2-CARBAMATE DERIVATIVES HAVING ANTI-IELMINTIC ACTIVITY [75] Inventors: Colin C. Beard, Palo Alto; John A.

Edwards, Los Altos; John H. Fried, Palo Alto, all of Calif.

[73] Assignee: Syntex (U.S.A.) Inc., Palo Alto,

Calif.

[22] Filed: May 28, 1974 [21] Appl. No.: 473,865

Related US. Application Data [63] Continuation-impart of Ser. No. 417,963, Nov. 21, 1973, which is a continuation-in-part of Ser. No. 319,299, Dec. 29, 1972, abandoned.

Primary ExaminerNatalie Trousof Attorney, Agent, or FirmJos eph I. Hirsch; William B. Walker 57 ABSTRACT This application relates to l,5(6)-disubstituted benzimidazole-2-carbamate derivatives represented by the following formula:

N l H R C NCOOR where R is lower alkyl having 1 to 4 carbon atoms; R is -SOR -SR-", -OR or M'(CH ),,MR R is lower alkyl having from 1 to 6 carbon atoms, cycloalkyl having 3 to 7 carbon atoms, lower alkenyl or lower alkynyl having 3 to 6 carbon atoms, or aralkyl or aryl; R is lower alkenyl, lower alkynyl or aralkyl; R is lower alkyl having 1 to 4 carbon atoms or aryl;

M and M are independently O,S,S or S',

l l O O n is 14; and R is phenyl, benzyl, phenethyl, or lower alkyl having 1 to 12 carbon atoms optionally substituted with a COOR group where R is lower alkyl having 1 to 4 carbon atoms;

The compounds are useful as pesticides, particularly as anthelmintic and antifungal agents.

32 Claims, No Drawings 1,5(6 )-DISUBSTITUTED BENZIZIMIDAZOLE-Z-CARBAMATE DERIVATIVES HAVING ANTHELMINTIC ACTIVITY REFERENCE TO PARENT APPLICATIONS This application is a continuation-in-part application of application Ser. No. 417,963, filed Nov. 21, 1973, which, in turn, is a continuation-in-part application of application Ser. No. 319,299, filed Dec. 29, 1972, now abandoned.

FIELD OF THE INVENTION This invention relates to novel chemical compounds. More particularly, this invention relates to novel 1 ,5(6)-disubstituted benzimidazole-2-carbamate derivatives having pesticidal, particularly anthelmintic, ac tivlty.

BACKGROUND OF THE INVENTION Anthelmintically active benzimidazole-Z-carbamate derivatives either unsubstituted at the 5(6)-position or substituted with different substituents than those described and claimed herein are known in this art (for example, see US. Letters Pat. Nos. 3,480,642; 3,573,321; 3,574,845; 3,578,676; and 3,595,870). Related fungicidal compounds are also shown in US. Letters Pat. Nos. 2,933,504 and 3,010,968.

SUMMARY OF THE INVENTION The novel l,5(6)-disubstituted benzimidazole-Z-carbamate derivatives of the present invention can be represented by the following formula:

N 1 H R c NCOOR c-NHR ll where R is lower alkyl having 1 to 4 carbon atoms; R is -SOR SR OR or M(CH ),,MR; R is lower alkyl having from 1 to 6 carbon atoms, cycloalkyl having 3 to 7 carbon atoms, lower alkenyl or lower alkynyl having 3 to 6 carbon atoms, or aralkyl or aryl; R is lower alkenyl, lower alkynyl or aralkyl; R is lower alkyl having 1 to 4 carbon atoms or aryl; M and M are independently O, S,

l SOIS; l l O O be, and thus includes primary, secondary and tertiary alkyl groups. Typical lower alkyls include, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, t-butyl, n-amyl, n-hexyl, octyl, nonyl, decyl, dodecyl, and the like. The term cycloalkyl refers to cyclic hydrocarbon groups having from 3 to 7 carbon atoms such as, for example, cyclopropyl, cyclopentyl, cyclohexyl, and the like. The term lower alkenyl refers to an unsaturated hydrocarbon group having from 3 to 6 carbon atoms and a single carbon-carbon double bond, provided that the double bond cannot be on the acarbon atom. Typical alkenyl groups include, for example, 2-propenyl, Z-butenyl, 3-butenyl, and the like. The term lower alkynyl refers to an unsaturated hydrocarbon group having from 3 to 6 carbon atoms, and a single carbon-carbon triple bond, provided also that the triple bond cannot be on the a-carbon atom. Typical alkynyl groups include, for example, 2-propynyl, 2-butynyl, 3-butynyl, and the like. An alkyl, alkenyl or alkynyl group of the R moiety can be optionally substituted with one or more radicals, for example, thiocyanato; alkoxy, such as methoxy; aryl, such as phenyl; aroyl, such as benzoyl; hydroxy; cycloalkyl; halo; cyano; or nitro radicals. The term alkoxy" refers to the group having the formula RO wherein R is a lower alkyl as defined above. Typical alkoxy groups include, for example, methoxy, ethoxy, t-butoxy and the like. The term halo refers to iodo, bromo, chloro, fluoro groups. The term aryl refers to an aromatic hydrocarbon group, such as phenyl. The term aralkyl refers to an aryl substituted alkyl group, such as, for example, benzyl or phenethyl. The aryl or aralkyl groups can be optionally substituted with one or more lower alkyl, alkoxy, halo or nitro radicals.

The compounds of the present invention, and the non-toxic salts thereof formed with pharmaceutically acceptable inorganic or organic acids, possess broad spectrum activity against parasites of mammals, including both mature and immature parasitic forms, as represented for example, by the genera Trichostronglylus, Haemonchus, Ostertagia, Cooperia, Nematodirus, and Stronglyoides, and specifically, for example against Nematospiroides dubius, Hymenolepis Nana, Syphacia obvelata, and/or Aspiculuris tetraptera. In particular, these compounds are found to exhibit high activity against various helminthic infections of the intestinal tract of economically important animals, coupled with low systemic toxicity to the host animal.

The compounds of the present invention are also useful as antifungal agents, particularly as systemic fungicides for controlling fungal diseases of plants of economic importance.

In addition to the stated anthelmintic and antifungal properties, certain compounds of the present invention are also useful as intermediates in the preparation of further compounds of this invention. For example, the 5(6)-thio compounds (i.e., where R is SR can be prepared and then utilized as starting materials for the preparation of the corresponding 5(6)-sulfinyl compounds.

Where the compound has a basic moiety, the term non-toxic salts as used herein refers to those pharmaceutically acceptable salts of the compounds of this invention which do not adversely affect the antifungal or anthelmintic properties of the basic compound, such as those salts conventionally used in the art. Such nontoxic salts include, for example, salts of inorganic acids such as, for example, sulfuric, sulfonic, sulfamic, nitric, phosphoric, hydrochloric acids and the like, and salts of organic acids such as, for example, acetic, citric, lactic, palmitic, tartaric, succinic, maleic, benzoic acids and the like. Where the compound has an acidic moiety, the non-toxic salts include cation salts, such as, for example, the salts of sodium, potassium, ammonium, and the like.

The amount of the compound to be administered will depend upon the actual compound utilized, and upon the weight of animal being treated. In general, however, the daily dosage level will usually be between about mg/kg and 100 mg/kg of body weight of the animal being treated. The active ingredient is adapted to be administered to the animal by mixing it with the diet of the animal, as with a feed mix, or formulating it with a non-toxic carrier to give anthelmintic compositions. The carrier may be an orally ingestible container for the active ingredient such as, for example, a gelatin capsule, or it may be an excipient of the kind normally used in medicaments of this character, including maize starch, terra alba, lactose, sucrose, calcium phosphate, gelatin, stearic acid, agar, pectin or the like. Examples of suitable liquid carriers are peanut oil, sesame oil and water.

A wide variety of pharmaceutical forms can be employed in those cases wherein the medicament is not admixed with the feed. Thus, if a solid carrier is used, the compound can be administered in tablet or capsule form. If a liquid carrier is used, the medicament may be in the form of a soft gelatin capsule or in a liquid suspension.

The compounds of the present invention are prepared by reacting a compound of the formula:

H l R C -NCOOR with a substituted isocyanate of the formula OCNR, where R, R and R are as defined above, in an inert organic solvent, for example tetrahydrofuran, at about 0C to about 40C, generally about room temperature, for about k hour to about 96 hours, generally about to 48 hours. Thereafter, the product is separated and purified by any suitable procedure. For example, typical separation procedures include filtration, extraction, evaporation, and typical purification procedures include crystallization, and both thin-layer and column chromatography. Optimum separation and isolation procedures can be obtained for any given step by routine experimentation as will be apparent to those skilled in this art. The product so obtained is a mixture of the 1,5-disubstituted and 1,6-disubstituted compounds, wherein, with respect to each compound, the R, R and R substituents are the same.

The compounds of Formula 11 above, and methods for the preparation thereof, are described in copending application Ser. No. 417,963, filed Nov. 21, 1973, and abandoned application Ser. No. 319,299, filed Dec. 29, 1972. The entire subject matter of both of the aforementioned applications are incorporated herein by reference.

In general, the compounds of Formula 11 can be prepared from benzene starting compounds having nitro and amino or acylamino (for example, acetamido) substituents at adjacent positions on the benzene nucleus (e.g., the land 2-positions), and the desired R moiety (or a moiety which can be reacted to give the desired R moiety) at the 4- or 5-position of the benzene nucleus (i.e., at what will be the 5- or 6-position of the benzimidazole compound to be prepared). The nitro group is reduced to an amino group to afford a benzene derivative having amino groups at the land 2-positions. The diamino compound is then reacted with a 1,3-bis(alkoxy-carbonyl)-S- alkyl-isothiourea to give the corresponding 5(6)-substituted benzimidazole 2-carbamate derivative.

The functional moiety at the 4- or 5-position of the benzene starting material can be, for example, a thiocyanato group which can be converted to an alkylthio or arylthio group, which, in turn, can be oxidized by known techniques, to the corresponding alkylor arylsulfinyl group. The functional moiety at the 4- or 5- position can also be chloro which can be reacted, for example, with a substituted or unsubstituted aryl mercaptan to afford the corresponding arylthio compound, which, in turn, can be oxidized to the corresponding arylsulfinyl group. The other compounds of Formula 11 hereof, where R is SOR or SR can be prepared in an analogous manner.

Compounds having the OR or O(CH ),,MR" substituent at the 5(6)-position can be prepared by reacting l-acetamido-4-hydroxy-2-nitrobenzene with a lower alkenyl halide (such as l-bromoprop-2-ene), a lower alkynyl halide (such as l-bromoprop-2-yne), an aralkyl halide (such as benzyl bromide), a haloalkyl aryl ether (such as 2-bromoethyl phenyl ether), a haloalkyl alkyl sulfide (such as chloromethyl methyl sulfide), or a haloalkyl alkyl ether (such as chloromethyl methyl ether), etc., and then conducting the steps, as necessary and as set forth above, to give the desired compound of Formula 11. Compounds having the S(CH ),,MR substituent at the 5(6)-position can be prepared by treating l-acetamido-2-nitro-4-thiocyanatobenzene, at room temperature with sodium borohydride in dimethylformamide for about A to about 2 hours, followed by treatment with a haloalkyl sulfide (such as chloromethyl methyl sulfide), a haloalkyl alkyl ether (such as chloromethyl methyl ether), a haloalkyl aryl sulfide (such as chloromethyl pchlorophenyl sulfide), etc., and then conducting the other steps, as necessary and as set forth above, to give the desired compound of Formula 11. The thio bridges in the M'(CH ),,MR substituents can be converted to the corresponding sulfinyl and/or sulfonyl bridges by oxidation with peracids accordingly to known techniques.

Exemplary of the compounds of the present invention as represented by structural formula 1 above, are the following illustrative compounds:

l-methylcarbamoyl-5( 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-ethoxycarbonylmethylcarbamoyl-S 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

1 -ethylcarbamoyl-5(6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-propylcarbamoyl-S 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-i-propylcarbamoyl-5( 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-5(6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

1-n-hexylcarbamoyl-5(6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

1 -phenylcarbamoyl- (6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-benzylcarbamoyl-S 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-phenethylcarbamoyl-5 6 )-phenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-5 6 )-methoxymethylsulfinyl-2- carbomethoxyaminobenzimidazole;

l-ethoxycarbonylmethylcarbamoyl-S 6 )-methoxyme* thylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-ethylcarbamoyl-5(6 )-methoxymethylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6)-phenoxyethoxy-2-carbomethoxyaminobenzimidazole;

l-n-propylcarbamoyl-S 6 )-methoxymethylsulfinyl-2- carbomethoxyaminobenzimidazole;

l -i-propylcarbamoyl-5 (6 )-methoxymethylsulfinyl-2- carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-methoxymethylsulfinyl-Z- carbomethoxyaminobenzimidazole;

l-n-hexylcarbamoyl-S 6 )-methoxymethylsulfinyl-2- carbomethoxyaminobenzimidazole;

l-phenylcarbamoyI-S 6 )-methoxymethylsulfinyl-Lcarbomethoxyaminobenzimidazole;

l-phenethylcarbamoyl-5(6 )-methoxymethylsulfinyl-2- carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-S 6 )-naphth-2'-ylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-naphth-2'-ylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-5(6 )-p-fluorophenylsulfinyl-Z-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-p-fluorophenylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-5(6 )-trifluoromethylmethylsulfinyl-2-carbomethoxyaminobenzimidazole;

ln-butylcarbamoyl-5(6 )-trifluoromethylmethylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-S 6 )-ethylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-ethylsulfinyl-2carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-methoxycthylsulfinyl- Zcarbornethoxyaminobenzimidazole;

l-methylcarbamoyl-5(6 )-n-propylsulfinyl-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-n-propylsulfinyl-2carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-S 6 )-n-butylsulfinyl-Z-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-n-butylsulfinyl-Z-carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-S 6 prop-2-enl -ylsulfinyl )-2- carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-5(6 )-(prop-2-enl -ylsulfinyl)-2- carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-5(6)-(prop-2-enl -ylthio)-2-carbomethoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 )-(prop-2-cnl -ylthio)-2carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-S 6 prop-Z-ynl -ylsulfinyl )-2- carbomethoxyaminobenzimidazole;

l -n-butylcarbamoyl-5 (6 )-(prop-2-ynl -ylsulfinyl)-2- carbomethoxyaminobenzimidazole;

l-methylcarbamoyl-5( 6 prop-2-ynl -ylthio )-2-carbomcthoxyaminobenzimidazole;

l-n-butylcarbamoyl-S 6 prop-2-yll -ylthio )-2-carbomethoxyaminobenzimidazole;

Of these compounds, the ln-butylcarbamoyl compounds, including l-n-butylcarbamoyl-5(6)-phenylsulfinyl-2carbomethoxyaminobenzimidazole and l-nbutylcarb amoyl-S 6 )-methoxymethylsulfinyl-2 carbomethoxyaminobenzimidazole, are presently preferred because they have shown substantial activity against certain of the helminths specifically referred to above.

DESCRIPTION OF THE SPECIFIC EMBODIMENTS The following specific description is given to enable those skilled in this art to more clearly understand and practice the present invention. It should not be considered as a limitation upon the scope of the invention but merely as being illustrative and representative thereof.

EXAMPLE I A suspension of l.4l g. of 5(6)-methoxymethylsulfinyl-2-carbomethoxyaminobenzimidazole in ml. of tetrahydrofuran is treated with 2.4 g. of n-butylisocyanate at room temperature (2025C). After 24 hours, 140 ml. of methylene chloride is added and the solution concentrated under vacuum at 20-30."C. The resulting precipitate is filtered off, washed with tetrahydrofuran and dried to afford l-n-butyIcarbamoyl-5(6)-methoxymethylsulfinyl-2-carbomethoxyaminobenzimidazole.

EXAMPLE II A suspension of 0.63 g. of 5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole in 50 ml. of tetrahydrofuran is treated at 2025C with 0.5 g. of phenylisocyanate. After 20 hours, the solution is concentrated under vacuum at 2030C and the residue triturated with acetone and filtered to afford l-phenylcarbamoyI-5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole.

EXAMPLE III A suspension of 0.95 g. of 5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole in 50 ml. of tetrahydrofuran is treated at 2025C with 0.7 g. of nbutylisocyanate. After 24 hours, the solution is concentrated under vacuum at 2030C. The residue is triturated with methanol, filtered, and washed with methanol to afford l-n-butylcarbamoyl-5(6)-pheriylsulfinyl- 2-carbomethoxyaminobenzimidazole.

EXAMPLE IV A slurry of 0.31 g. of (6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole in l8 ml. of tetrahydrofuran is treated with 0.26 g. of ethoxycarbonylmethylisocyanate at 25C for 24 hours. Concentration of the solvent under vacuum and filtration affords l-ethoxycarbonylmethylcarbamoyl-S(6)-phenysulfinyl-2-carbomethoxyaminobenzimidazole.

EXAMPLE V A suspension of 0.95 g. of 5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole in ml. of tetrahydrofuran is treated with 0.4 g. of methylisocyanate at 2025C. After 48 hours, the product is filtered off and dried under vacuum to afford l-methylcarbamoyl- 5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole.

In similar manner to the Examples above, using the corresponding 2-carbethoxyamino-, 2-carbopropox yamino-, and 2-carbobutoxyamin0 compounds, 5(6)- phenylsulfinyl-2-carbomethoxyaminobenzimidazole, 5(6)-methoxymethylsulfinyl-2-carbomethoxyaminobenzimidazole, 5(6)-naphth-2-ylsulfinyl-2-carbomethoxyaminobenzimidazole, 5(6)-p-fluorophenylsulfinyl-2-carbomethoxyaminobenzimidazole, 5(6)-trifluoromethylmethylsulfinyl-2-carbomethoxyaminobenzimidazole, 5(6)-ethylsulfinyl-2-carbomethoxyaminobenzimidazole, 5 6 )-n-propylsulfinyl-Z-carbomethoxyaminobenzimidazole, 5(6)-n-butylsulfinyl- 2-carbomethoxyaminobenzimidazole, 5(6)-(prop-enl-ylsulfinyl)-2-carbomethoxyaminobenzimidazole, 5(6)-(prop-en-l-ylthio)-2-carbomethoxyaminobenzimidazole, 5(6)-(prop-yn-l-ylsulfinyl)-2-carbomethoxyaminobenzimidazole, 5(6)-(prop-yn-l-ylthio)-2- carbornethoxyaminobenzimidazole, 5(6)-methoxymethylthio-2-carbometh0xyaminobenzimidazole, 5(6)-methylthiomethoxy-2-carbomethoxyaminobenzimidazole, 5(6 )-methylsulfinylmethoxy-Z-carbomethoxyaminobenzimidazole, 5(6)-methoxymethoxy-2- carbomethoxyaminobenzimidazole, 5(6)-(2,2,3,3-tetrafluoropropylsulfinyl)-2-carbomethoxyaminobenzimidazole, 5(6)-trifluoromethylmethylsulfinyl-Z-carbomethoxyaminobenzimidazole, 5(6)-methoxyethylsulfinyl-2-carbomethoxyaminobenzimidazole, and 5(6)-phenoxyethoxy-2-carbomethoxy-aminobenzimidazole, or the corresponding 2-carbethoxyamino, 2-carbopropoxyaminoand 2-carbobutoxyamino compounds thereof for the substituted benzimidazole 2-carbamate utilized in the Examples, and utilizing the desired substituted isocyanate reactant (corresponding to OCNR defined above), the corresponding compounds of Formula I are prepared.

In the preceeding paragraph, the specific reaction utilized in the Examples above has been extended, in a general sense, to the preparation of other similar and related compounds, embraced by the present invention. It should be understood, however, that, with respect to any compound which has been prepared by the extension of this specific reaction sequence, it may be necessary or desirable to utilize solvents, reaction media, recrystallization media, reaction times or temperatures, etc., other than the ones given in the Examples above. This variation is deemed to be within the skill of those working in this art and will be apparent from a consideration of the particular reactants utilized and/or particular compound desired to be produced.

While the present invention has been described with reference to specific embodiments thereof, it should be understood by those skilled in this art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation, material or composition of matter, process, process, process step or steps, or then-present objective to the spirit of this invention without departing from its essential teachings.

What is claimed is:

l. A compound selected from the group of compounds represented by the formula:

R1 CECOOR N (|3-NHR8 ii 1) where R is lower alkyl having 1 to 4 carbon atoms; R is SOR SR OR or M'(CH ),,MR R is lower alkyl having from 1 to 6 carbon atoms, cycloalkyl having 3 to 7 carbon atoms, lower alkenyl or lower alkynyl having 3 to 6 carbon atoms, phenyl, benzyl or phenethyl; R is lower alkenyl or lower alkynyl having 3 to 6 carbon atoms, benzyl or phenethyl; R is lower alkyl having 1 to 4 carbon atoms or phenyl; M and M are independently O, S, S or S; n is 1-4; and R is phenyl, benzyl, phenethyl, or lower alkyl having 1 to 12 carbon atoms and optionally substituted with a COOR group where R is lower alkyl having 1 to 4 carbon atoms; the R substitution being at the 5(6)-position; or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1 wherein R is -SOR 3. The compound of claim 1 wherein R is -SR".

4. The compound of claim 1 wherein R is -OR''.

5. The compound of claim 1 wherein R is -S(CH ),,SR".

6. The compound of claim 1 wherein R is -S(CH ),,OR

7. The compound of claim 1 wherein R is -O(CH ),,OR.

8. The compound of claim 1 wherein R is O(CH ),,SR

9. The compound of claim 1 wherein R is O(Cl-l ),,SR

10. The compound of claim 1 wherein R is -(CH ),,OR

11. The compound of claim 1 wherein R is lower alkyl.

12. The compound of claim 1 wherein R is lower alkenyl.

13. The compound of claim 1 wherein R is lower alkynyl.

l4. The compound of claim 1 wherein R is phenyl.

15. The compound of claim 1 wherein R is phenysulfin l.

l 6. The compound of claim 1 wherein R is benzyl or phenethyl.

17. The compound of claim 1 wherein R is lower alkynyl.

18. The compound of claim 1 wherein R is lower alkenyl.

19. The compound of claim 1 wherein R is benzyl or phenethyl.

20. The compound of claim 1 wherein R is lower alkyl optionally substituted with a COOR group where R is defined in claim 1.

21. The compound of claim 1 wherein R is phenyl.

22. The compound of claim 1 wherein R is benzyl or phcnethyl.

23. The compound of claim 1 wherein R is n-butyl.

24. The compound of claim 1 wherein R is methyl.

25. The compound of claim 1 wherein said compound is l-methylcarbamoyl-5(6)-phenylsulfinyl-2- carbomethoxyaminobenzimidazole.

able salt thereof.

(5/69) UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Inventor(s) BEARD et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the first page of the patent, in the Title, "BENZIZIMIDA ZOLE" should read BENZIMIDAZOLE On the first page of the patent, in the Abstract, in the third line from the bottom, after "having 1 to 4 carbon atoms", insert the R substitution is at the 5(6)position. Column 1, line 3, "BENZIZIMIDAZOLE" should read BENZIMIDAZOLE Column 7, line 40, "5 (6 should read 5(6)- Column 8, line 33, "O, S, S or S" should read v O, S, 2 or Claim 6, lines 1 and 2, "S (CH 0R should read S (CH OR n g 2 n "O(CH 7., 7 OR should read 0 (CH OR 28, "phenylcarbamoyl" midazole.

Claim 7, lines 1 and 2,

Column 10, line 9, Claim should read carbomethoxyaminobenzi- Signed. and Sealed this twenty-ninth D3) Of June 1976 [SEAL] Y Arrest.-

RUTH C. MASON Arresting Officer c. MARSHALL DANN (or nmim'oner oj'larents and Trademarks 

1. A COMPOUND SELECTED FROM THE GROUP OF COMPOUNDS REPRESENTED BY THE FORMULA:
 2. The compound of claim 1 wherein R1 is -SOR2.
 3. The compound of claim 1 wherein R1 is -SR5.
 4. The compound of claim 1 wherein R1 is -OR5.
 5. The compound of claim 1 wherein R1 is -S(CH2)nSR7.
 6. The compound of claim 1 wherein R1 is -S(CH2)nOR7.
 7. The compound of claim 1 wherein R1 is -O(CH2)nOR7.
 8. The compound of claim 1 wherein R1 is -O(CH2)nSR7.
 9. The compound of claim 1 wherein R1 is -O(CH2)nSR7
 10. The compound of claim 1 wherein R1 is -S(CH2)nOR7.
 11. The compound of claim 1 wherein R2 is lower alkyl.
 12. The compound of claim 1 wherein R2 is lower alkenyl.
 13. The compound of claim 1 wherein R2 is lower alkynyl.
 14. The compound of claim 1 wherein R2 is phenyl.
 15. The compound of claim 1 wherein R1 is phenysulfinyl.
 16. The compound of claim 1 wherein R2 is benzyl or phenethyl.
 17. The compound of claim 1 wherein R5 is lower alkynyl.
 18. The compound of claim 1 wherein R5 is lower alkenyl.
 19. The compound of claim 1 wherein R5 is benzyl or phenethyl.
 20. The compound of claim 1 wherein R8 is lower alkyl optionally substituted with a -COOR group where R is as defined in claim
 1. 21. The compound of claim 1 wherein R8 is phenyl.
 22. The compound of claim 1 wherein R8 is benzyl or phenethyl.
 23. The compound of claim 1 wherein R8 is n-butyl.
 24. The compound of claim 1 wherein R is methyl.
 25. The compound of claim 1 wherein said compound is 1-methylcarbamoyl-5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole.
 26. The compound of claim 1 wherein said compound is 1-ethoxycarbonylmethylcarbamoyl-5(6)-phenylsulfinyl-2 -carbomethoxyaminobenzimidazole.
 27. The compound of claim 1 wherein said compound is 1-n-butylcarbamoyl-5(6)-phenylsulfinyl-2-carbomethoxyaminobenzimidazole.
 28. The compound of claim 1 wherein said compound is 11phenylcarbamoyl-5(6)-phenylsulfinyl-2-phenylcarbamoyl-
 29. The compound of claim 1 wherein said compound is 1-n-butylcarbamoyl-5(6)-methoxymethylsulfinyl-2 -carbomethoxyaminobenzimidazole.
 30. The compound of claim 1 wherein said compound is 1-n-butylcarbamoyl-5(6)-phenoxyethoxy-2-carbomethoxyaminobenzimidazole.
 31. The compound of claim 1 wherein said compound is 1-n-butylcarbamoyl-5(6)-methoxyethylsulfinyl-2 -carbomethoxyaminobenzimidazole.
 32. 1-methylcarbamoyl-5(6)-naphth-2''-ylsulfinyl)-2 -carbomethoxyaminobenzimidazole, 1-n-butylcarbamoyl-5(6)-(naphth-2''-ylsulfinyl)-2 -carbomethoxyaminobenzimidazole, or a pharmaceutically acceptable salt thereof. 